Skateboard surface



FIG. 1 is a front view of a skateboard surface showing my new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a side view thereof.

The broken lines represent the environment in which the article resides and forms no part of the claimed design. 

CLAIM The ornamental design for a skateboard surface, as shown and described. 